html, body {
    width: 100%;
    height: 100%;
}

/*返回上一步*/
.backstep {
    width: 100%;
    height: 50px;
    line-height: 50px;
    text-align: center;
    color: #fff;
    background: url('../images/opacity5.png');
    position: fixed;
    left: 0px;
    bottom: 0px;
}

.backstep a {
    display: block;
    width: 100%;
    height: 100%;
    color: #fff;
}

.btn {
    padding: 8px 15px;
    background: #8899ff;
    font-weight: bold;
    color: #fff;
    border-radius: 3px;
    margin: 5px;
}

@-webkit-keyframes photo-transform {
    from {
        -webkit-transform: perspective(400px) rotateY(180deg);
        transform: perspective(400px) rotateY(180deg);
    }
    to {
        -webkit-transform: perspective(400px) rotateY(0deg);
        transform: perspective(400px) rotateY(0deg);
    }
}

@keyframes photo-transform {
    from {
        -webkit-transform: perspective(400px) rotateY(180deg);
        transform: perspective(400px) rotateY(180deg);
    }
    to {
        -webkit-transform: perspective(400px) rotateY(0deg);
        transform: perspective(400px) rotateY(0deg);
    }
}
